sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #ifdef INET6
  40 #include <sys/proc.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctp_var.h>
  44 #include <netinet6/sctp6_var.h>
  45 #include <netinet/sctp_sysctl.h>
  46 #include <netinet/sctp_output.h>
  47 #include <netinet/sctp_uio.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctputil.h>
  50 #include <netinet/sctp_indata.h>
  51 #include <netinet/sctp_timer.h>
  52 #include <netinet/sctp_auth.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_output.h>
  55 #include <netinet/sctp_bsd_addr.h>
  56 #include <netinet/sctp_crc32.h>
  57 #include <netinet/icmp6.h>
  58 #include <netinet/udp.h>
  59
  60 int
  61 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  62 {
  63         struct mbuf *m;
  64         int iphlen;
  65         uint32_t vrf_id;
  66         uint8_t ecn_bits;
  67         struct sockaddr_in6 src, dst;
  68         struct ip6_hdr *ip6;
  69         struct sctphdr *sh;
  70         struct sctp_chunkhdr *ch;
  71         int length, offset;
  72         uint8_t compute_crc;
  73         uint32_t mflowid;
  74         uint8_t mflowtype;
  75         uint16_t fibnum;
  76
  77         iphlen = *offp;
  78         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  79                 SCTP_RELEASE_PKT(*i_pak);
  80                 return (IPPROTO_DONE);
  81         }
  82         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  83 #ifdef SCTP_MBUF_LOGGING
  84         /* Log in any input mbufs */
  85         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  86                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  87         }
  88 #endif
  89 #ifdef SCTP_PACKET_LOGGING
  90         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  91                 sctp_packet_log(m);
  92         }
  93 #endif
  94         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  95             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
  96             m->m_pkthdr.len,
  97             if_name(m->m_pkthdr.rcvif),
  98             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
  99         mflowid = m->m_pkthdr.flowid;
 100         mflowtype = M_HASHTYPE_GET(m);
 101         fibnum = M_GETFIB(m);
 102         SCTP_STAT_INCR(sctps_recvpackets);
 103         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 104         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 105         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 106         if (m->m_len < offset) {
 107                 m = m_pullup(m, offset);
 108                 if (m == NULL) {
 109                         SCTP_STAT_INCR(sctps_hdrops);
 110                         return (IPPROTO_DONE);
 111                 }
 112         }
 113         ip6 = mtod(m, struct ip6_hdr *);
 114         sh = (struct sctphdr *)(mtod(m, caddr_t)+iphlen);
 115         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 116         offset -= sizeof(struct sctp_chunkhdr);
 117         memset(&src, 0, sizeof(struct sockaddr_in6));
 118         src.sin6_family = AF_INET6;
 119         src.sin6_len = sizeof(struct sockaddr_in6);
 120         src.sin6_port = sh->src_port;
 121         src.sin6_addr = ip6->ip6_src;
 122         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 123                 goto out;
 124         }
 125         memset(&dst, 0, sizeof(struct sockaddr_in6));
 126         dst.sin6_family = AF_INET6;
 127         dst.sin6_len = sizeof(struct sockaddr_in6);
 128         dst.sin6_port = sh->dest_port;
 129         dst.sin6_addr = ip6->ip6_dst;
 130         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 131                 goto out;
 132         }
 133         length = ntohs(ip6->ip6_plen) + iphlen;
 134         /* Validate mbuf chain length with IP payload length. */
 135         if (SCTP_HEADER_LEN(m) != length) {
 136                 SCTPDBG(SCTP_DEBUG_INPUT1,
 137                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 138                 SCTP_STAT_INCR(sctps_hdrops);
 139                 goto out;
 140         }
 141         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 142                 goto out;
 143         }
 144         ecn_bits = IPV6_TRAFFIC_CLASS(ip6);
 145         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 146                 SCTP_STAT_INCR(sctps_recvhwcrc);
 147                 compute_crc = 0;
 148         } else {
 149                 SCTP_STAT_INCR(sctps_recvswcrc);
 150                 compute_crc = 1;
 151         }
 152         sctp_common_input_processing(&m, iphlen, offset, length,
 153             (struct sockaddr *)&src,
 154             (struct sockaddr *)&dst,
 155             sh, ch,
 156             compute_crc,
 157             ecn_bits,
 158             mflowtype, mflowid, fibnum,
 159             vrf_id, port);
 160 out:
 161         if (m) {
 162                 sctp_m_freem(m);
 163         }
 164         return (IPPROTO_DONE);
 165 }
 166
 167 int
 168 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 169 {
 170         return (sctp6_input_with_port(i_pak, offp, 0));
 171 }
 172
 173 void
 174 sctp6_notify(struct sctp_inpcb *inp,
 175     struct sctp_tcb *stcb,
 176     struct sctp_nets *net,
 177     uint8_t icmp6_type,
 178     uint8_t icmp6_code,
 179     uint32_t next_mtu)
 180 {
 181         int timer_stopped;
 182
 183         switch (icmp6_type) {
 184         case ICMP6_DST_UNREACH:
 185                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 186                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 187                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 188                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 189                         /* Mark the net unreachable. */
 190                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 191                                 /* Ok that destination is not reachable */
 192                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 193                                 net->dest_state &= ~SCTP_ADDR_PF;
 194                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 195                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 196                         }
 197                 }
 198                 SCTP_TCB_UNLOCK(stcb);
 199                 break;
 200         case ICMP6_PARAM_PROB:
 201                 /* Treat it like an ABORT. */
 202                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 203                         sctp_abort_notification(stcb, true, false, 0, NULL, SCTP_SO_NOT_LOCKED);
 204                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 205                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 206                 } else {
 207                         SCTP_TCB_UNLOCK(stcb);
 208                 }
 209                 break;
 210         case ICMP6_PACKET_TOO_BIG:
 211                 if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
 212                         SCTP_TCB_UNLOCK(stcb);
 213                         break;
 214                 }
 215                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 216                         timer_stopped = 1;
 217                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 218                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 219                 } else {
 220                         timer_stopped = 0;
 221                 }
 222                 /* Update the path MTU. */
 223                 if (net->port) {
 224                         next_mtu -= sizeof(struct udphdr);
 225                 }
 226                 if (net->mtu > next_mtu) {
 227                         net->mtu = next_mtu;
 228                         if (net->port) {
 229                                 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu + sizeof(struct udphdr));
 230                         } else {
 231                                 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu);
 232                         }
 233                 }
 234                 /* Update the association MTU */
 235                 if (stcb->asoc.smallest_mtu > next_mtu) {
 236                         sctp_pathmtu_adjustment(stcb, next_mtu);
 237                 }
 238                 /* Finally, start the PMTU timer if it was running before. */
 239                 if (timer_stopped) {
 240                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 241                 }
 242                 SCTP_TCB_UNLOCK(stcb);
 243                 break;
 244         default:
 245                 SCTP_TCB_UNLOCK(stcb);
 246                 break;
 247         }
 248 }
 249
 250 void
 251 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 252 {
 253         struct ip6ctlparam *ip6cp;
 254         struct sctp_inpcb *inp;
 255         struct sctp_tcb *stcb;
 256         struct sctp_nets *net;
 257         struct sctphdr sh;
 258         struct sockaddr_in6 src, dst;
 259
 260         if (pktdst->sa_family != AF_INET6 ||
 261             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 262                 return;
 263         }
 264
 265         if ((unsigned)cmd >= PRC_NCMDS) {
 266                 return;
 267         }
 268         if (PRC_IS_REDIRECT(cmd)) {
 269                 d = NULL;
 270         } else if (inet6ctlerrmap[cmd] == 0) {
 271                 return;
 272         }
 273         /* If the parameter is from icmp6, decode it. */
 274         if (d != NULL) {
 275                 ip6cp = (struct ip6ctlparam *)d;
 276         } else {
 277                 ip6cp = (struct ip6ctlparam *)NULL;
 278         }
 279
 280         if (ip6cp != NULL) {
 281                 /*
 282                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 283                  * valid.
 284                  */
 285                 if (ip6cp->ip6c_m == NULL) {
 286                         return;
 287                 }
 288
 289                 /*
 290                  * Check if we can safely examine the ports and the
 291                  * verification tag of the SCTP common header.
 292                  */
 293                 if (ip6cp->ip6c_m->m_pkthdr.len <
 294                     (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 295                         return;
 296                 }
 297
 298                 /* Copy out the port numbers and the verification tag. */
 299                 memset(&sh, 0, sizeof(sh));
 300                 m_copydata(ip6cp->ip6c_m,
 301                     ip6cp->ip6c_off,
 302                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 303                     (caddr_t)&sh);
 304                 memset(&src, 0, sizeof(struct sockaddr_in6));
 305                 src.sin6_family = AF_INET6;
 306                 src.sin6_len = sizeof(struct sockaddr_in6);
 307                 src.sin6_port = sh.src_port;
 308                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 309                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 310                         return;
 311                 }
 312                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 313                 dst.sin6_family = AF_INET6;
 314                 dst.sin6_len = sizeof(struct sockaddr_in6);
 315                 dst.sin6_port = sh.dest_port;
 316                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 317                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 318                         return;
 319                 }
 320                 inp = NULL;
 321                 net = NULL;
 322                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 323                     (struct sockaddr *)&src,
 324                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 325                 if ((stcb != NULL) &&
 326                     (net != NULL) &&
 327                     (inp != NULL)) {
 328                         /* Check the verification tag */
 329                         if (ntohl(sh.v_tag) != 0) {
 330                                 /*
 331                                  * This must be the verification tag used
 332                                  * for sending out packets. We don't
 333                                  * consider packets reflecting the
 334                                  * verification tag.
 335                                  */
 336                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 337                                         SCTP_TCB_UNLOCK(stcb);
 338                                         return;
 339                                 }
 340                         } else {
 341                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 342                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 343                                     sizeof(struct sctp_chunkhdr) +
 344                                     offsetof(struct sctp_init, a_rwnd)) {
 345                                         /*
 346                                          * In this case we can check if we
 347                                          * got an INIT chunk and if the
 348                                          * initiate tag matches.
 349                                          */
 350                                         uint32_t initiate_tag;
 351                                         uint8_t chunk_type;
 352
 353                                         m_copydata(ip6cp->ip6c_m,
 354                                             ip6cp->ip6c_off +
 355                                             sizeof(struct sctphdr),
 356                                             sizeof(uint8_t),
 357                                             (caddr_t)&chunk_type);
 358                                         m_copydata(ip6cp->ip6c_m,
 359                                             ip6cp->ip6c_off +
 360                                             sizeof(struct sctphdr) +
 361                                             sizeof(struct sctp_chunkhdr),
 362                                             sizeof(uint32_t),
 363                                             (caddr_t)&initiate_tag);
 364                                         if ((chunk_type != SCTP_INITIATION) ||
 365                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 366                                                 SCTP_TCB_UNLOCK(stcb);
 367                                                 return;
 368                                         }
 369                                 } else {
 370                                         SCTP_TCB_UNLOCK(stcb);
 371                                         return;
 372                                 }
 373                         }
 374                         sctp6_notify(inp, stcb, net,
 375                             ip6cp->ip6c_icmp6->icmp6_type,
 376                             ip6cp->ip6c_icmp6->icmp6_code,
 377                             ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 378                 } else {
 379                         if ((stcb == NULL) && (inp != NULL)) {
 380                                 /* reduce inp's ref-count */
 381                                 SCTP_INP_WLOCK(inp);
 382                                 SCTP_INP_DECR_REF(inp);
 383                                 SCTP_INP_WUNLOCK(inp);
 384                         }
 385                         if (stcb) {
 386                                 SCTP_TCB_UNLOCK(stcb);
 387                         }
 388                 }
 389         }
 390 }
 391
 392 /*
 393  * this routine can probably be collasped into the one in sctp_userreq.c
 394  * since they do the same thing and now we lookup with a sockaddr
 395  */
 396 static int
 397 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 398 {
 399         struct xucred xuc;
 400         struct sockaddr_in6 addrs[2];
 401         struct sctp_inpcb *inp;
 402         struct sctp_nets *net;
 403         struct sctp_tcb *stcb;
 404         int error;
 405         uint32_t vrf_id;
 406
 407         vrf_id = SCTP_DEFAULT_VRFID;
 408
 409         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 410         if (error)
 411                 return (error);
 412
 413         if (req->newlen != sizeof(addrs)) {
 414                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 415                 return (EINVAL);
 416         }
 417         if (req->oldlen != sizeof(struct ucred)) {
 418                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 419                 return (EINVAL);
 420         }
 421         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 422         if (error)
 423                 return (error);
 424
 425         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 426             sin6tosa(&addrs[0]),
 427             &inp, &net, 1, vrf_id);
 428         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 429                 if ((inp != NULL) && (stcb == NULL)) {
 430                         /* reduce ref-count */
 431                         SCTP_INP_WLOCK(inp);
 432                         SCTP_INP_DECR_REF(inp);
 433                         goto cred_can_cont;
 434                 }
 435                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 436                 error = ENOENT;
 437                 goto out;
 438         }
 439         SCTP_TCB_UNLOCK(stcb);
 440         /*
 441          * We use the write lock here, only since in the error leg we need
 442          * it. If we used RLOCK, then we would have to
 443          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 444          * Better to use higher wlock.
 445          */
 446         SCTP_INP_WLOCK(inp);
 447 cred_can_cont:
 448         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 449         if (error) {
 450                 SCTP_INP_WUNLOCK(inp);
 451                 goto out;
 452         }
 453         cru2x(inp->sctp_socket->so_cred, &xuc);
 454         SCTP_INP_WUNLOCK(inp);
 455         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 456 out:
 457         return (error);
 458 }
 459
 460 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred,
 461     CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
 462     0, 0, sctp6_getcred, "S,ucred",
 463     "Get the ucred of a SCTP6 connection");
 464
 465 /* This is the same as the sctp_abort() could be made common */
 466 static void
 467 sctp6_abort(struct socket *so)
 468 {
 469         struct epoch_tracker et;
 470         struct sctp_inpcb *inp;
 471         uint32_t flags;
 472
 473         inp = (struct sctp_inpcb *)so->so_pcb;
 474         if (inp == NULL) {
 475                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 476                 return;
 477         }
 478         NET_EPOCH_ENTER(et);
 479 sctp_must_try_again:
 480         flags = inp->sctp_flags;
 481 #ifdef SCTP_LOG_CLOSING
 482         sctp_log_closing(inp, NULL, 17);
 483 #endif
 484         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 485             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 486 #ifdef SCTP_LOG_CLOSING
 487                 sctp_log_closing(inp, NULL, 16);
 488 #endif
 489                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 490                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 491                 SOCK_LOCK(so);
 492                 SCTP_SB_CLEAR(so->so_snd);
 493                 /*
 494                  * same for the rcv ones, they are only here for the
 495                  * accounting/select.
 496                  */
 497                 SCTP_SB_CLEAR(so->so_rcv);
 498                 /* Now null out the reference, we are completely detached. */
 499                 so->so_pcb = NULL;
 500                 SOCK_UNLOCK(so);
 501         } else {
 502                 flags = inp->sctp_flags;
 503                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 504                         goto sctp_must_try_again;
 505                 }
 506         }
 507         NET_EPOCH_EXIT(et);
 508         return;
 509 }
 510
 511 static int
 512 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 513 {
 514         int error;
 515         struct sctp_inpcb *inp;
 516         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 517
 518         inp = (struct sctp_inpcb *)so->so_pcb;
 519         if (inp != NULL) {
 520                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 521                 return (EINVAL);
 522         }
 523
 524         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 525                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 526                 if (error)
 527                         return (error);
 528         }
 529         error = sctp_inpcb_alloc(so, vrf_id);
 530         if (error)
 531                 return (error);
 532         inp = (struct sctp_inpcb *)so->so_pcb;
 533         SCTP_INP_WLOCK(inp);
 534         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 535
 536         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
 537         inp->ip_inp.inp.in6p_hops = -1; /* use kernel default */
 538         inp->ip_inp.inp.in6p_cksum = -1;        /* just to be sure */
 539 #ifdef INET
 540         /*
 541          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 542          * socket as well, because the socket may be bound to an IPv6
 543          * wildcard address, which may match an IPv4-mapped IPv6 address.
 544          */
 545         inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 546 #endif
 547         SCTP_INP_WUNLOCK(inp);
 548         return (0);
 549 }
 550
 551 static int
 552 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 553 {
 554         struct sctp_inpcb *inp;
 555         int error;
 556         u_char vflagsav;
 557
 558         inp = (struct sctp_inpcb *)so->so_pcb;
 559         if (inp == NULL) {
 560                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 561                 return (EINVAL);
 562         }
 563
 564         if (addr) {
 565                 switch (addr->sa_family) {
 566 #ifdef INET
 567                 case AF_INET:
 568                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 569                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 570                                 return (EINVAL);
 571                         }
 572                         break;
 573 #endif
 574 #ifdef INET6
 575                 case AF_INET6:
 576                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 577                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 578                                 return (EINVAL);
 579                         }
 580                         break;
 581 #endif
 582                 default:
 583                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 584                         return (EINVAL);
 585                 }
 586         }
 587         vflagsav = inp->ip_inp.inp.inp_vflag;
 588         inp->ip_inp.inp.inp_vflag &= ~INP_IPV4;
 589         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
 590         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp) == 0)) {
 591                 switch (addr->sa_family) {
 592 #ifdef INET
 593                 case AF_INET:
 594                         /* binding v4 addr to v6 socket, so reset flags */
 595                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 596                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 597                         break;
 598 #endif
 599 #ifdef INET6
 600                 case AF_INET6:
 601                         {
 602                                 struct sockaddr_in6 *sin6_p;
 603
 604                                 sin6_p = (struct sockaddr_in6 *)addr;
 605
 606                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 607                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 608                                 }
 609 #ifdef INET
 610                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 611                                         struct sockaddr_in sin;
 612
 613                                         in6_sin6_2_sin(&sin, sin6_p);
 614                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 615                                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 616                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 617                                         goto out;
 618                                 }
 619 #endif
 620                                 break;
 621                         }
 622 #endif
 623                 default:
 624                         break;
 625                 }
 626         } else if (addr != NULL) {
 627                 struct sockaddr_in6 *sin6_p;
 628
 629                 /* IPV6_V6ONLY socket */
 630 #ifdef INET
 631                 if (addr->sa_family == AF_INET) {
 632                         /* can't bind v4 addr to v6 only socket! */
 633                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 634                         error = EINVAL;
 635                         goto out;
 636                 }
 637 #endif
 638                 sin6_p = (struct sockaddr_in6 *)addr;
 639
 640                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 641                         /* can't bind v4-mapped addrs either! */
 642                         /* NOTE: we don't support SIIT */
 643                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 644                         error = EINVAL;
 645                         goto out;
 646                 }
 647         }
 648         error = sctp_inpcb_bind(so, addr, NULL, p);
 649 out:
 650         if (error != 0)
 651                 inp->ip_inp.inp.inp_vflag = vflagsav;
 652         return (error);
 653 }
 654
 655 static void
 656 sctp6_close(struct socket *so)
 657 {
 658         sctp_close(so);
 659 }
 660
 661 /* This could be made common with sctp_detach() since they are identical */
 662
 663 static
 664 int
 665 sctp6_disconnect(struct socket *so)
 666 {
 667         return (sctp_disconnect(so));
 668 }
 669
 670 int
 671 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 672     struct mbuf *control, struct thread *p);
 673
 674 static int
 675 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 676     struct mbuf *control, struct thread *p)
 677 {
 678         struct sctp_inpcb *inp;
 679
 680 #ifdef INET
 681         struct sockaddr_in6 *sin6;
 682 #endif                          /* INET */
 683         /* No SPL needed since sctp_output does this */
 684
 685         inp = (struct sctp_inpcb *)so->so_pcb;
 686         if (inp == NULL) {
 687                 if (control) {
 688                         SCTP_RELEASE_PKT(control);
 689                         control = NULL;
 690                 }
 691                 SCTP_RELEASE_PKT(m);
 692                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 693                 return (EINVAL);
 694         }
 695         /*
 696          * For the TCP model we may get a NULL addr, if we are a connected
 697          * socket thats ok.
 698          */
 699         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 700             (addr == NULL)) {
 701                 goto connected_type;
 702         }
 703         if (addr == NULL) {
 704                 SCTP_RELEASE_PKT(m);
 705                 if (control) {
 706                         SCTP_RELEASE_PKT(control);
 707                         control = NULL;
 708                 }
 709                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 710                 return (EDESTADDRREQ);
 711         }
 712         switch (addr->sa_family) {
 713 #ifdef INET
 714         case AF_INET:
 715                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 716                         if (control) {
 717                                 SCTP_RELEASE_PKT(control);
 718                                 control = NULL;
 719                         }
 720                         SCTP_RELEASE_PKT(m);
 721                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 722                         return (EINVAL);
 723                 }
 724                 break;
 725 #endif
 726 #ifdef INET6
 727         case AF_INET6:
 728                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 729                         if (control) {
 730                                 SCTP_RELEASE_PKT(control);
 731                                 control = NULL;
 732                         }
 733                         SCTP_RELEASE_PKT(m);
 734                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 735                         return (EINVAL);
 736                 }
 737                 break;
 738 #endif
 739         default:
 740                 if (control) {
 741                         SCTP_RELEASE_PKT(control);
 742                         control = NULL;
 743                 }
 744                 SCTP_RELEASE_PKT(m);
 745                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 746                 return (EINVAL);
 747         }
 748 #ifdef INET
 749         sin6 = (struct sockaddr_in6 *)addr;
 750         if (SCTP_IPV6_V6ONLY(inp)) {
 751                 /*
 752                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 753                  * v4 addr or v4-mapped addr
 754                  */
 755                 if (addr->sa_family == AF_INET) {
 756                         if (control) {
 757                                 SCTP_RELEASE_PKT(control);
 758                                 control = NULL;
 759                         }
 760                         SCTP_RELEASE_PKT(m);
 761                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 762                         return (EINVAL);
 763                 }
 764                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 765                         if (control) {
 766                                 SCTP_RELEASE_PKT(control);
 767                                 control = NULL;
 768                         }
 769                         SCTP_RELEASE_PKT(m);
 770                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 771                         return (EINVAL);
 772                 }
 773         }
 774         if ((addr->sa_family == AF_INET6) &&
 775             IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 776                 struct sockaddr_in sin;
 777
 778                 /* convert v4-mapped into v4 addr and send */
 779                 in6_sin6_2_sin(&sin, sin6);
 780                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 781         }
 782 #endif                          /* INET */
 783 connected_type:
 784         /* now what about control */
 785         if (control) {
 786                 if (inp->control) {
 787                         SCTP_PRINTF("huh? control set?\n");
 788                         SCTP_RELEASE_PKT(inp->control);
 789                         inp->control = NULL;
 790                 }
 791                 inp->control = control;
 792         }
 793         /* Place the data */
 794         if (inp->pkt) {
 795                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 796                 inp->pkt_last = m;
 797         } else {
 798                 inp->pkt_last = inp->pkt = m;
 799         }
 800         if (
 801         /* FreeBSD and MacOSX uses a flag passed */
 802             ((flags & PRUS_MORETOCOME) == 0)
 803             ) {
 804                 /*
 805                  * note with the current version this code will only be used
 806                  * by OpenBSD, NetBSD and FreeBSD have methods for
 807                  * re-defining sosend() to use sctp_sosend().  One can
 808                  * optionaly switch back to this code (by changing back the
 809                  * defininitions but this is not advisable.
 810                  */
 811                 struct epoch_tracker et;
 812                 int ret;
 813
 814                 NET_EPOCH_ENTER(et);
 815                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 816                 NET_EPOCH_EXIT(et);
 817                 inp->pkt = NULL;
 818                 inp->control = NULL;
 819                 return (ret);
 820         } else {
 821                 return (0);
 822         }
 823 }
 824
 825 static int
 826 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 827 {
 828         struct epoch_tracker et;
 829         uint32_t vrf_id;
 830         int error = 0;
 831         struct sctp_inpcb *inp;
 832         struct sctp_tcb *stcb;
 833 #ifdef INET
 834         struct sockaddr_in6 *sin6;
 835         union sctp_sockstore store;
 836 #endif
 837
 838         inp = (struct sctp_inpcb *)so->so_pcb;
 839         if (inp == NULL) {
 840                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 841                 return (ECONNRESET);    /* I made the same as TCP since we are
 842                                          * not setup? */
 843         }
 844         if (addr == NULL) {
 845                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 846                 return (EINVAL);
 847         }
 848         switch (addr->sa_family) {
 849 #ifdef INET
 850         case AF_INET:
 851                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 852                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 853                         return (EINVAL);
 854                 }
 855                 break;
 856 #endif
 857 #ifdef INET6
 858         case AF_INET6:
 859                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 860                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 861                         return (EINVAL);
 862                 }
 863                 break;
 864 #endif
 865         default:
 866                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 867                 return (EINVAL);
 868         }
 869
 870         vrf_id = inp->def_vrf_id;
 871         SCTP_ASOC_CREATE_LOCK(inp);
 872         SCTP_INP_RLOCK(inp);
 873         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 874             SCTP_PCB_FLAGS_UNBOUND) {
 875                 /* Bind a ephemeral port */
 876                 SCTP_INP_RUNLOCK(inp);
 877                 error = sctp6_bind(so, NULL, p);
 878                 if (error) {
 879                         SCTP_ASOC_CREATE_UNLOCK(inp);
 880
 881                         return (error);
 882                 }
 883                 SCTP_INP_RLOCK(inp);
 884         }
 885         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 886             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 887                 /* We are already connected AND the TCP model */
 888                 SCTP_INP_RUNLOCK(inp);
 889                 SCTP_ASOC_CREATE_UNLOCK(inp);
 890                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 891                 return (EADDRINUSE);
 892         }
 893 #ifdef INET
 894         sin6 = (struct sockaddr_in6 *)addr;
 895         if (SCTP_IPV6_V6ONLY(inp)) {
 896                 /*
 897                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 898                  * addr or v4-mapped addr
 899                  */
 900                 if (addr->sa_family == AF_INET) {
 901                         SCTP_INP_RUNLOCK(inp);
 902                         SCTP_ASOC_CREATE_UNLOCK(inp);
 903                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 904                         return (EINVAL);
 905                 }
 906                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 907                         SCTP_INP_RUNLOCK(inp);
 908                         SCTP_ASOC_CREATE_UNLOCK(inp);
 909                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 910                         return (EINVAL);
 911                 }
 912         }
 913         if ((addr->sa_family == AF_INET6) &&
 914             IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 915                 /* convert v4-mapped into v4 addr */
 916                 in6_sin6_2_sin(&store.sin, sin6);
 917                 addr = &store.sa;
 918         }
 919 #endif                          /* INET */
 920         /* Now do we connect? */
 921         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 922                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 923                 if (stcb) {
 924                         SCTP_TCB_LOCK(stcb);
 925                 }
 926                 SCTP_INP_RUNLOCK(inp);
 927         } else {
 928                 SCTP_INP_RUNLOCK(inp);
 929                 SCTP_INP_WLOCK(inp);
 930                 SCTP_INP_INCR_REF(inp);
 931                 SCTP_INP_WUNLOCK(inp);
 932                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 933                 if (stcb == NULL) {
 934                         SCTP_INP_WLOCK(inp);
 935                         SCTP_INP_DECR_REF(inp);
 936                         SCTP_INP_WUNLOCK(inp);
 937                 }
 938         }
 939
 940         if (stcb != NULL) {
 941                 /* Already have or am bring up an association */
 942                 SCTP_ASOC_CREATE_UNLOCK(inp);
 943                 SCTP_TCB_UNLOCK(stcb);
 944                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 945                 return (EALREADY);
 946         }
 947         /* We are GOOD to go */
 948         stcb = sctp_aloc_assoc(inp, addr, &error, 0, 0, vrf_id,
 949             inp->sctp_ep.pre_open_stream_count,
 950             inp->sctp_ep.port, p,
 951             SCTP_INITIALIZE_AUTH_PARAMS);
 952         SCTP_ASOC_CREATE_UNLOCK(inp);
 953         if (stcb == NULL) {
 954                 /* Gak! no memory */
 955                 return (error);
 956         }
 957         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 958                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 959                 /* Set the connected flag so we can queue data */
 960                 soisconnecting(so);
 961         }
 962         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 963         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 964         NET_EPOCH_ENTER(et);
 965         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 966         SCTP_TCB_UNLOCK(stcb);
 967         NET_EPOCH_EXIT(et);
 968         return (error);
 969 }
 970
 971 static int
 972 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 973 {
 974         struct sockaddr_in6 *sin6;
 975         struct sctp_inpcb *inp;
 976         uint32_t vrf_id;
 977         struct sctp_ifa *sctp_ifa;
 978
 979         int error;
 980
 981         /*
 982          * Do the malloc first in case it blocks.
 983          */
 984         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 985         if (sin6 == NULL)
 986                 return (ENOMEM);
 987         sin6->sin6_family = AF_INET6;
 988         sin6->sin6_len = sizeof(*sin6);
 989
 990         inp = (struct sctp_inpcb *)so->so_pcb;
 991         if (inp == NULL) {
 992                 SCTP_FREE_SONAME(sin6);
 993                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 994                 return (ECONNRESET);
 995         }
 996         SCTP_INP_RLOCK(inp);
 997         sin6->sin6_port = inp->sctp_lport;
 998         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 999                 /* For the bound all case you get back 0 */
1000                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1001                         struct sctp_tcb *stcb;
1002                         struct sockaddr_in6 *sin_a6;
1003                         struct sctp_nets *net;
1004                         int fnd;
1005
1006                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1007                         if (stcb == NULL) {
1008                                 SCTP_INP_RUNLOCK(inp);
1009                                 SCTP_FREE_SONAME(sin6);
1010                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1011                                 return (ENOENT);
1012                         }
1013                         fnd = 0;
1014                         sin_a6 = NULL;
1015                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1016                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1017                                 if (sin_a6 == NULL)
1018                                         /* this will make coverity happy */
1019                                         continue;
1020
1021                                 if (sin_a6->sin6_family == AF_INET6) {
1022                                         fnd = 1;
1023                                         break;
1024                                 }
1025                         }
1026                         if ((!fnd) || (sin_a6 == NULL)) {
1027                                 /* punt */
1028                                 SCTP_INP_RUNLOCK(inp);
1029                                 SCTP_FREE_SONAME(sin6);
1030                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1031                                 return (ENOENT);
1032                         }
1033                         vrf_id = inp->def_vrf_id;
1034                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
1035                         if (sctp_ifa) {
1036                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1037                         }
1038                 } else {
1039                         /* For the bound all case you get back 0 */
1040                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1041                 }
1042         } else {
1043                 /* Take the first IPv6 address in the list */
1044                 struct sctp_laddr *laddr;
1045                 int fnd = 0;
1046
1047                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1048                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1049                                 struct sockaddr_in6 *sin_a;
1050
1051                                 sin_a = &laddr->ifa->address.sin6;
1052                                 sin6->sin6_addr = sin_a->sin6_addr;
1053                                 fnd = 1;
1054                                 break;
1055                         }
1056                 }
1057                 if (!fnd) {
1058                         SCTP_FREE_SONAME(sin6);
1059                         SCTP_INP_RUNLOCK(inp);
1060                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1061                         return (ENOENT);
1062                 }
1063         }
1064         SCTP_INP_RUNLOCK(inp);
1065         /* Scoping things for v6 */
1066         if ((error = sa6_recoverscope(sin6)) != 0) {
1067                 SCTP_FREE_SONAME(sin6);
1068                 return (error);
1069         }
1070         (*addr) = (struct sockaddr *)sin6;
1071         return (0);
1072 }
1073
1074 static int
1075 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1076 {
1077         struct sockaddr_in6 *sin6;
1078         int fnd;
1079         struct sockaddr_in6 *sin_a6;
1080         struct sctp_inpcb *inp;
1081         struct sctp_tcb *stcb;
1082         struct sctp_nets *net;
1083         int error;
1084
1085         /* Do the malloc first in case it blocks. */
1086         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1087         if (sin6 == NULL)
1088                 return (ENOMEM);
1089         sin6->sin6_family = AF_INET6;
1090         sin6->sin6_len = sizeof(*sin6);
1091
1092         inp = (struct sctp_inpcb *)so->so_pcb;
1093         if ((inp == NULL) ||
1094             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1095                 /* UDP type and listeners will drop out here */
1096                 SCTP_FREE_SONAME(sin6);
1097                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1098                 return (ENOTCONN);
1099         }
1100         SCTP_INP_RLOCK(inp);
1101         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1102         if (stcb) {
1103                 SCTP_TCB_LOCK(stcb);
1104         }
1105         SCTP_INP_RUNLOCK(inp);
1106         if (stcb == NULL) {
1107                 SCTP_FREE_SONAME(sin6);
1108                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1109                 return (ECONNRESET);
1110         }
1111         fnd = 0;
1112         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1113                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1114                 if (sin_a6->sin6_family == AF_INET6) {
1115                         fnd = 1;
1116                         sin6->sin6_port = stcb->rport;
1117                         sin6->sin6_addr = sin_a6->sin6_addr;
1118                         break;
1119                 }
1120         }
1121         SCTP_TCB_UNLOCK(stcb);
1122         if (!fnd) {
1123                 /* No IPv4 address */
1124                 SCTP_FREE_SONAME(sin6);
1125                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1126                 return (ENOENT);
1127         }
1128         if ((error = sa6_recoverscope(sin6)) != 0) {
1129                 SCTP_FREE_SONAME(sin6);
1130                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1131                 return (error);
1132         }
1133         *addr = (struct sockaddr *)sin6;
1134         return (0);
1135 }
1136
1137 static int
1138 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1139 {
1140         struct inpcb *inp = sotoinpcb(so);
1141         int error;
1142
1143         if (inp == NULL) {
1144                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1145                 return (EINVAL);
1146         }
1147
1148         /* allow v6 addresses precedence */
1149         error = sctp6_getaddr(so, nam);
1150 #ifdef INET
1151         if (error) {
1152                 struct sockaddr_in6 *sin6;
1153
1154                 /* try v4 next if v6 failed */
1155                 error = sctp_ingetaddr(so, nam);
1156                 if (error) {
1157                         return (error);
1158                 }
1159                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1160                 if (sin6 == NULL) {
1161                         SCTP_FREE_SONAME(*nam);
1162                         return (ENOMEM);
1163                 }
1164                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1165                 SCTP_FREE_SONAME(*nam);
1166                 *nam = (struct sockaddr *)sin6;
1167         }
1168 #endif
1169         return (error);
1170 }
1171
1172 static int
1173 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1174 {
1175         struct inpcb *inp = sotoinpcb(so);
1176         int error;
1177
1178         if (inp == NULL) {
1179                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1180                 return (EINVAL);
1181         }
1182
1183         /* allow v6 addresses precedence */
1184         error = sctp6_peeraddr(so, nam);
1185 #ifdef INET
1186         if (error) {
1187                 struct sockaddr_in6 *sin6;
1188
1189                 /* try v4 next if v6 failed */
1190                 error = sctp_peeraddr(so, nam);
1191                 if (error) {
1192                         return (error);
1193                 }
1194                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1195                 if (sin6 == NULL) {
1196                         SCTP_FREE_SONAME(*nam);
1197                         return (ENOMEM);
1198                 }
1199                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1200                 SCTP_FREE_SONAME(*nam);
1201                 *nam = (struct sockaddr *)sin6;
1202         }
1203 #endif
1204         return (error);
1205 }
1206
1207 struct pr_usrreqs sctp6_usrreqs = {
1208         .pru_abort = sctp6_abort,
1209         .pru_accept = sctp_accept,
1210         .pru_attach = sctp6_attach,
1211         .pru_bind = sctp6_bind,
1212         .pru_connect = sctp6_connect,
1213         .pru_control = in6_control,
1214         .pru_close = sctp6_close,
1215         .pru_detach = sctp6_close,
1216         .pru_sopoll = sopoll_generic,
1217         .pru_flush = sctp_flush,
1218         .pru_disconnect = sctp6_disconnect,
1219         .pru_listen = sctp_listen,
1220         .pru_peeraddr = sctp6_getpeeraddr,
1221         .pru_send = sctp6_send,
1222         .pru_shutdown = sctp_shutdown,
1223         .pru_sockaddr = sctp6_in6getaddr,
1224         .pru_sosend = sctp_sosend,
1225         .pru_soreceive = sctp_soreceive
1226 };
1227
1228 #endif